Bench-clamp



(Model) J. MURPHY.

Bench Clamp.

Patented Jan. 25,1881.

No 237,04L

WITNESSES yJNVENTOR ATTORNEYS.

ILPETERS, PHOTO-LITRQGRAPH KJNITED STATES PATENT OFFIcE.

JAMES MURPHY, OF SAN ANTONIO, TEXAS.

BENCH-CLAM P.

SPECIFICATION forming part of Letters Patent No. 237,041, dated January25, 1881.

Application filed October 14,1880. (Mode-l.)

To all whom it may concern:

Be it known that I, JAMES MURPHY, of San Antonio, in the county of Bexarand State of Texas, have invented a new and Improved Bench-Gla1np,ofwhich the following is a specification.

The object of this invention is to provide animproved clamp ortail-screw for carpenters and cabinet-makers use, whereby pressure maybe brought against the ends of any object to hold it in position on awork-bench.

Figure 1 is a perspective view of the device. Fig. 2 is a side elevationof the same, partly in section, in position on a work-bench.

Similar letters of reference indicate corresponding parts.

In the drawings, Arepresents the flat metal base-plate provided with alongitudinal groove, a, on itsupper face to accomodate the screwratchetwheel F. B is a rectangular boss or head, projecting upward from one endof said plate A and provided with a longitudinal screw-threadedperforation, b, for reception of the screw E, and (J is the foot formingan integral part of said plate A, or being secured thereto, which foot 0is projected straight downward for a short distance and has its toe Oinclined forward, as shown, the face of said toe 0 being transverselyserrated, as shown at c. A screw, E, having on its front end a' block orhead, D, and on its rear end a ratchetwheel, F, is passed through theperforation b in the head B parallel with the face of the plate A.

G is the ratchet-lever, having a forked lower end, the longer prong ofwhich is provided with a slot, f, and having a web, 9, between saidforks. Said lever G is secured to the rear end of the screw E, with itsforked end straddling the ratchet-wheel F by a screw or stud, h, thatpasses through the slot f into the end of the screw E. The screw E isturned by engaging the -web g of the lever G in a radial socket, i, ofthe wheel F, and then moving the said lever G in one or the otherdirection, disengaging said web 9 from the socket t and moving the leverG to engage said web 9 in another socket, i1, renewing the purchase ofthe lever G at each quarter or half turn of the screw E.

The wheel F is serrated transversely, as

shown at s s, between the sockets M, to facilitate the operation of thescrew E, by hand, up to the point of applying pressure by means of thelever G.

H represents a carpenters bench, provided with sockets m correspondingin shape with the foot 0 of the clamp.

I represents a dog or stop-block, inserted in one of the sockets m, toserve as a support against which to press or clamp a block of wood orother object, K, that is to be operated upon. The foot 0 of the clamp ortail-screw A is then inserted in asocket, m, and the screw E turned tobring its head D against the opposite end of the object K and hold itrigidly in position. The inclination of the upper face of the toe O, andthe serrations c thereon, engaging against the inclined portion of thesocket m, serve to hold said dex'ioe firmly down in its place.

Being made of iron or other suitable material, this clanip or tail-screwis strong, durable, and inexpensive. It requires no bolts or screws tosecure it to the work-bench or other object where its use may berequired, and can be put in position and removed easily and quickly. Itoccupies but little room on account of its compactness, and can beapplied to any piece of work without marring it.

I do not limit the use of this clamp or tailscrew to the work-bench, asitis designed, also, for general use in shops or other places where theuse of clamps is required for cramping up doors, sashes, blinds, andother articles, for which purposes and uses it is eminently adapted,where any suitable piece of scantling or plank is furnished withsuitable sockets for described.

JAMES MURPHY. Witnesses:

J. F. MENTER, Gno. W. CALDWELL.

